2 * \file tpl_drv_common.h
3 * \brief Common Driver Interface Definitions
4 * \author John Hodge (thePowersGang)
6 * \section Introduction
7 * There are two ways Acess drivers can communicate with userspace
8 * applications, both are through the VFS. The first is by exposing a
9 * device as a file buffer, the second is by sending commands via the
10 * ioctl() system call.
11 * All drivers in Acess must at least conform to the specifcation in this
12 * file (even if it is just implementing eTplDrv_IOCtl.DRV_IOCTL_TYPE and
13 * returning eTplDrv_Type.DRV_TYPE_NULL, however, doing so is discouraged)
15 * \section ioctls Core IOCtl calls
16 * As said, the core Acess driver specifcation defines specific IOCtl calls
17 * that all drivers should implement. The four core IOCtls (defined in
18 * ::eTplDrv_IOCtl) allow another binary (wether it be a user-mode application
19 * or another driver) to tell what type of device a driver provides, the
20 * basic identifcation of the driver (4 character ID and BCD version number)
21 * and be able to use externally standardised calls that may not have
22 * standardised call numbers.
23 * NOTE: All ioctl calls WILL return -1 if the driver ran into an error
24 * of its own fault while executing the call. If the user was at fault
25 * (e.g. by passing a bad buffer) the call will return -2.
27 * \section types Driver Types
28 * When the eTplDrv_IOCtl.DRV_IOCTL_TYPE call is made, the driver should
29 * return the relevant entry in the ::eTplDrv_Type enumeration that describes
30 * what sub-specifcation (and hence, what device type) it implements.
31 * These device types are described in their own files, which are liked
32 * from their entries in ::eTplDrv_Type.
39 * \brief Common IOCtl Calls
44 * \brief Get driver type
45 * \return The relevant entry from ::eTplDrv_Type
50 * ioctl(..., char *dest[32])
51 * \brief Get driver identifier string
52 * \return 0 on no error
54 * This call sets the 32-byte array \a dest to the drivers 31 charater
55 * identifier. This identifier must be unique to the driver series.
61 * \brief Get driver version number
62 * \return 24-bit BCD version number (2.2.2)
64 * This call returns the 6-digit (2 major, 2 minor, 2 patch) version
65 * number of the driver.
70 * ioctl(..., char *name)
71 * \brief Get a IOCtl call ID from a symbolic name
72 * \return ID number of the call, or 0 if not found
74 * This call allows user applications to not need to know the ID numbers
75 * of this driver's IOCtl calls by taking a string and returning the
76 * IOCtl call number associated with that method name.
82 * \brief eTplDrv_IOCtl.DRV_IOCTL_LOOKUP names for the core IOCtls
83 * These are the official lookup names of the core calls
85 #define DRV_IOCTLNAMES "type", "ident", "version", "lookup"
88 * \brief Helper macro for the base IOCtl calls
89 * \param _type Type number from eTplDrv_Type to return
90 * \param _ident String of max 32-characters that identifies this driver
91 * \param _version Driver's 8.8.8 BCD version number
92 * \param _ioctls Pointer to the IOCtls string array
93 * \warning If you have DEBUG enabled in the calling file, this function
94 * will do LEAVE()s before returning, so make sure that the
95 * IOCtl function is ENTER()ed when using debug with this macro
97 * Usage: (Id is the IOCtl call ID)
101 * BASE_IOCTLS(DRV_TYPE_MISC, "Ident", 0x100, csaIOCtls)
102 * // Your IOCtls go here, starting at index 4
106 #define BASE_IOCTLS(_type, _ident, _version, _ioctls) \
107 case DRV_IOCTL_TYPE: LEAVE('i', (_type)); return (_type);\
108 case DRV_IOCTL_IDENT: {\
109 int tmp = ModUtil_SetIdent(Data, (_ident));\
110 LEAVE('i', tmp); return tmp;\
112 case DRV_IOCTL_VERSION: LEAVE('x', (_version)); return (_version);\
113 case DRV_IOCTL_LOOKUP:{\
114 int tmp = ModUtil_LookupString( _ioctls, (const char*)Data );\
121 * \brief Driver Types returned by DRV_IOCTL_TYPE
124 DRV_TYPE_NULL, //!< NULL Type - Custom Interface
125 DRV_TYPE_MISC, //!< Miscelanious Compilant - Supports the core calls
126 DRV_TYPE_TERMINAL, //!< Terminal - see tpl_drv_terminal.h
127 DRV_TYPE_VIDEO, //!< Video - see tpl_drv_video.h
128 DRV_TYPE_SOUND, //!< Audio
129 DRV_TYPE_DISK, //!< Disk - see tpl_drv_disk.h
130 DRV_TYPE_KEYBOARD, //!< Keyboard - see tpl_drv_keyboard.h
131 DRV_TYPE_MOUSE, //!< Mouse
132 DRV_TYPE_JOYSTICK, //!< Joystick / Gamepad
133 DRV_TYPE_NETWORK //!< Network Device - see tpl_drv_network.h